Need Perkins 4.108 Expert

[BozSail]

I have replaced the rear main oil seal twice. First time was 5 years ago. Leaked a little, but not too bad. Replaced it again in July 2024. Now it leaks worse. What could be the problem? I'm thinking just not installing the seal properly. I welcome a ny helpful tips.

[Kello]

I'm not a Perkins expert, but an engine is an engine, and since you said you'd welcome any tips ...

My neighbor has a very old Perkins, and in one of our conversations I kinda remember he mentioned that the rear oil seal is made of flax, and since he hasn't started his engine in many years that the flax would be dried out and leak next time he started the engine. See if your engine is old enough to have been designed for a flax seal, and if you have replaced it with a modern packing (they are Teflon now?) that may be your problem.

If your engine is newer and has a prefab rubber seal, then maybe your shaft is worn at the seal, IMO, the fix for that isn't worth the time or trouble, put an oil diaper under the transmission and go sailing. Also, did you grease the shaft (and seal lip) before you installed the seal?